#定义函数
#def hl_abs(x):
    #if x >= 1:
    #    return x
    #else:
    # return -x
#print(hl_abs(-5))
#空函数
#def nop():
    #pass
#if age >= 18:
    #pass
#返回多个值
#import math
#def move(x,y,step,hl=0):
    #nx = x + step *math.cos(hl)
    #ny = y -step * math.sin(hl)
    #return nx,ny
#x,y = move(100,100,60,math.pi / 6)
#print(x,y)